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Gas sensor based on lead-free halide perovskite and manufacturing method thereof

A halide perovskite and gas sensor technology, which is applied in the field of gas recognition, can solve the problems of unfavorable environmental protection, poor chemical and structural stability of the sensor, and the lower limit of NO2 detection is not low enough, and achieves low price, short response and recovery time, The effect of simple structure

Active Publication Date: 2020-06-23
CHONGQING UNIV
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  • Application Information

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Problems solved by technology

Although some progress has been made, the following problems still exist: the chemical and structural stability of the sensor is poor; the use of pb as a toxic element for sensor production is not conducive to environmental protection; 2 The detection limit is not low enough

Method used

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  • Gas sensor based on lead-free halide perovskite and manufacturing method thereof
  • Gas sensor based on lead-free halide perovskite and manufacturing method thereof
  • Gas sensor based on lead-free halide perovskite and manufacturing method thereof

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Simple modifications to this example are easy and obvious to those skilled in the art.

[0025] The chemical raw materials used in the following examples are cesium iodide (CsI, 99.9%), copper iodide (CuI, 99.95%), N,N dimethylformamide (DMF, 99.8%), dimethylsulfoxide (DMSO , 98%). Cesium halide was used to provide cesium source, copper halide was used to provide copper source, and DMF and DMSO were used as dispersants. The preparation process of the lead-free halide perovskite material is as follows figure 1 .

[0026] The preparation method of the gas sensor based on the lead-free halide perovskite comprises the following steps according to the following proportions of the materials:

[0027] (1) Dissolve 1mmol CsI and 2mmol CuI in a mixed solvent of 1mL DMF and DMSO, the v:v=4:1 of DMF and DMSO, and stir for 1 hour in a glove box at 60°C under vacu...

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Abstract

The invention provides a gas sensor based on lead-free halide perovskite and a manufacturing method thereof. The manufacturing method comprises the following steps: (1) dissolving 1 mmol of CsI and 2mmol of CuI into 1 mL of a mixed solvent of N, N-dimethylformamide and dimethyl sulfoxide, and stirring for 1 hour in a glove box under a vacuum condition at 60 DEG C to obtain a CsCu2I3 precursor solution; (2) spin-coating 100 muL of the precursor solution on a clean gold interdigital electrode at a speed of 3000 rpm to form a CsCu2I3 film, and dropping 100 muL of methyl acetate in the center ofthe rotating gold interdigital electrode in the last 5 s; and (3) annealing a film in the glove box at 100 DEG C for 1 hour to evaporate the residual solvent and promote crystallization so as to manufacture the CsCu2I3 gas sensor. The sensor is used for detecting a nitrogen dioxide gas. An environmental pollution gas nitrogen dioxide is detected by observing a change of a resistance value of the sensor.

Description

technical field [0001] The invention relates to a gas sensor based on lead-free halide perovskite and a preparation method thereof, which are used for detecting nitrogen dioxide and belong to the technical field of gas identification. Background technique [0002] Nitrogen dioxide (NO 2 ) as the most important environmental pollutant gas will cause great harm to human health, inhaling NO 2 Afterwards, it is highly irritating and corrosive to lung tissue, thus damaging the respiratory tract. In addition, long-term exposure to NO 2 In the polluted gas environment, chronic diseases such as neurasthenia syndrome and chronic respiratory inflammation syndrome will be caused. NO 2 It is also one of the causes of acid rain, and the environmental effects include: the impact on the competition and composition changes between wetland and terrestrial plant species, the reduction of atmospheric visibility, the acidification of surface water, eutrophication, and the increase of harmfu...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 何邕孙霞唐孝生杨洁郭学政伍志林
Owner CHONGQING UNIV